- #1
ekinnike
- 27
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i can't find it anywhere. please help. i need to kno the inegration of lnx to find an area. please help thx
lol i didnt learn those yet. BUt I am glad it more complicated than it look. NO i can't do it. BUt i really appriciated the help. Instead i will try use simpsons rule. the question is area under the curve. 2day is monday-im at school school today so i quickly ask one of the mathematics teacher. =) i think he also hesitated say u can solve them by harder way but instead he told me simpson ruleVietDao29 said:Integration is a Calculus topic, and therefore, should not be posted in the Precalculus section.
Anyway, to integrate ln(x), we use Integration by Parts (have you covered Integration by Parts yet?), i.e:
[tex]\int u dv = uv - \int v du[/tex]
We often use Integration by Parts, when no other methods can solve the integral.
So, we want to integrate this:
[tex]\int \ln (x) dx[/tex]
We then let u = ln(x), and dv = dx
So that implies du = dx / x, and v = x.
Substitute all those into the formula, we have:
[tex]\int \ln (x) dx = x \ln (x) - \int x \times \frac{dx}{x} = ...[/tex]
Can you go from here? :)
The general rule for integrating ln(x) is to use the property of logarithms, which states that ln(xy) = ln(x) + ln(y). This means that when integrating ln(x), you can break it down into the sum of two separate integrals.
Yes, you can use u-substitution to integrate ln(x), but you will also need to use the property of logarithms mentioned above. This will help simplify the integral and make it easier to solve.
The integration formula for ln(x) is ∫ ln(x) dx = xln(x) - x + C, where C is the constant of integration. This formula can be derived from the general rule for integrating ln(x) mentioned above.
Yes, there are multiple methods for integrating ln(x). Besides using u-substitution and the integration formula, you can also use integration by parts or partial fractions to solve for the integral.
Yes, you can integrate ln(x) with a different base by using the change of base formula, which states that logb(x) = ln(x)/ln(b). This will convert the logarithm into a natural logarithm, which can then be integrated using the methods mentioned above.